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3.2 WORKING CONDITIONS <br /> The work includes excavation of refuse or contact with refuse. Potential <br /> hazards due to the presence of buried refuse include those associated with <br /> LFG and refuse itself. <br /> A. REFUSE <br /> FHSL is a Class III landfill which contains household refuse, demolition <br /> debris, tree trimmings, and miscellaneous refuse. To the best <br /> knowledge of the County, hazardous materials have not been disposed <br /> at the site. <br /> Unidentified drums may be present in the refuse at FHSL. If drums are <br /> removed during drilling, the area will be cordoned off and San Joaquin <br /> County Office Of Emergency Services will be notified. <br /> B. LANDFILL GAS (LFG) <br /> When buried in a landfill, refuse and other organic material produces <br /> LFG, which is approximately 50 percent methane by volume and may <br /> contain other contaminants. The lower explosive limit of methane is <br /> 5 percent by volume. <br /> Potential hazards of LFG are: <br /> • Fire <br /> • Explosion <br /> Potential hazards associated with LFG are due to: <br /> • Oxygen defiance in the landfill gas <br /> • Combustible characteristics of landfill gas <br /> • Potential for hydrogen sulfide in LFG <br /> Work Plan Foothill Sanitary Landfill <br /> Replacement LFG Extraction Well Installation_2011 4 <br />